Results 1 to 10 of about 63,875 (229)
X-ray bolometric corrections for Compton-thick active galactic nuclei [PDF]
The Astrophysical Journal, 2017 We present X-ray bolometric correction factors, $\kappa_{Bol}$ ($\equiv L_{Bol}/L_X$), for Compton-thick (CT) active galactic nuclei (AGN) with the aim of testing AGN torus models, probing orientation effects, and estimating the bolometric output of the ...
Ballantyne, D. R. +18 more
core +12 more sources
X-ray Eclipses of Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2017 X-ray variation is a ubiquitous feature of active galactic nuclei (AGNs), however, its origin is not well understood. In this paper, we show that the X-ray flux variations in some AGNs, and correspondingly the power spectral densities (PSDs) of the ...
Lu, Youjun, Yu, Qingjuan, Zhang, Fupeng
core +2 more sources
Soft X-ray active galactic nuclei.
The Astrophysical Journal, 1984 The discovery of 10 active galactic nuclei (AGNs) based upon optical observations of Einstein Observatory X-ray sources is reported. The new objects are optically similar to AGNs that have been identified by others with this technique. One notable exception, the quasar E1821 + 643, is associated with a previously unidentified X-ray source detected with
F. Marshall, S. Pravdo
semanticscholar +2 more sources
OCCUPATION OF X-RAY-SELECTED GALAXY GROUPS BY X-RAY ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 2012 We present the first direct measurement of the mean halo occupation distribution (HOD) of X-ray-selected active galactic nuclei (AGNs) in the COSMOS field at z ⩽ 1, based on the association of 41 XMM and 17 C-COSMOS AGNs with member galaxies of 189 X-ray-
V. Allevato +14 more
semanticscholar +10 more sources
Review on Active Galactic Nuclei at hard X-ray energies [PDF]
Proceedings of An INTEGRAL view of the high-energy sky (the first 10 years) - 9th INTEGRAL Workshop and celebration of the 10th anniversary of the launch — PoS(INTEGRAL 2012), 2013 Hard X-ray surveys are an important tool for the study of active galactic nuclei (AGN): they provide almost an unbiased view of absorption in the extragalactic population, allow the study of spectral features such as reflection and high energy cut-off ...
Bassani, Loredana +8 more
core +2 more sources
X-ray Properties of Radio-Selected Dual Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2019 Merger simulations predict that tidally induced gas inflows can trigger kpc-scale dual active galactic nuclei (dAGN) in heavily obscured environments. Previously with the Very Large Array, we have confirmed four dAGN with redshifts between $0.04 < z < 0 ...
Djorgovski, S . G. +4 more
core +5 more sources
Host galaxy properties of X-ray active galactic nuclei in the local Universe [PDF]
Astronomy & Astrophysics, 2021 We study the host galaxy properties of active galactic nuclei (AGN) that have been detected in X-rays in the nearby Universe ( z < 0 . 2). For that purpose, we use the catalogue provided by the ROSAT-2RXS in the 0.1–2.4keV energy band, one of the largest
L. Koutoulidis +4 more
semanticscholar +1 more source
Reverberation mapping of active galactic nuclei: from X-ray corona to dusty torus [PDF]
iScience, 2021 Summary The central engines of active galactic nuclei (AGNs) are powered by accreting supermassive black holes, and while AGNs are known to play an important role in galaxy evolution, the key physical processes occur on scales that are too small to be ...
E. Cackett, M. Bentz, E. Kara
semanticscholar +1 more source
Comprehensive Broadband X-Ray and Multiwavelength Study of Active Galactic Nuclei in 57 Local Luminous and Ultraluminous Infrared Galaxies Observed with NuSTAR and/or Swift/BAT [PDF]
Astrophysical Journal Supplement Series, 2021 We perform a systematic X-ray spectroscopic analysis of 57 local luminous and ultraluminous infrared galaxy systems (containing 84 individual galaxies) observed with the Nuclear Spectroscopic Telescope Array and/or Swift/BAT.
S. Yamada +6 more
semanticscholar +1 more source
Probing black hole accretion tracks, scaling relations, and radiative efficiencies from stacked X-ray active galactic nuclei [PDF]
Monthly notices of the Royal Astronomical Society, 2019 The masses of supermassive black holes at the centres of local galaxies appear to be tightly correlated with the mass and velocity dispersions of their galactic hosts.
F. Shankar +27 more
semanticscholar +1 more source